I suppose they help while away the time when on the travelator, otherwise I don’t really notice them. My son has taken a very nice photo of his younger brother, in front of the SAA business class advert showing a Hippo lying fully flat on the new SAA seat. It really looks as if he is sitting on the plane next to the hippo.
Slightly off track, but I used to like the “Pretty Polly” adverts on the London Underground. Sadly now removed as being non “PC”!